VS: Make ImportLibary generation optional

Fixes: #21180

5 files changed, 41 insertions, 10 deletions

diff --git a/Source/cmLocalVisualStudio7Generator.cxx b/Source/cmLocalVisualStudio7Generator.cxx
index 7795654..b54a83f 100644
--- a/Source/cmLocalVisualStudio7Generator.cxx
+++ b/Source/cmLocalVisualStudio7Generator.cxx
@@ -1081,11 +1081,13 @@ void cmLocalVisualStudio7Generator::OutputBuildTool(
       if (stackVal) {
         fout << "\t\t\t\tStackReserveSize=\"" << *stackVal << "\"\n";
       }
-      temp = cmStrCat(
-        target->GetDirectory(configName, cmStateEnums::ImportLibraryArtifact),
-        '/', targetNames.ImportLibrary);
-      fout << "\t\t\t\tImportLibrary=\""
-           << this->ConvertToXMLOutputPathSingle(temp) << "\"";
+      if (!targetNames.ImportLibrary.empty()) {
+        temp = cmStrCat(target->GetDirectory(
+                          configName, cmStateEnums::ImportLibraryArtifact),
+                        '/', targetNames.ImportLibrary);
+        fout << "\t\t\t\tImportLibrary=\""
+             << this->ConvertToXMLOutputPathSingle(temp) << "\"";
+      }
       if (this->FortranProject) {
         fout << "\n\t\t\t\tLinkDLL=\"true\"";
       }
diff --git a/Source/cmVisualStudio10TargetGenerator.cxx b/Source/cmVisualStudio10TargetGenerator.cxx
index a7b90b4..c025814 100644
--- a/Source/cmVisualStudio10TargetGenerator.cxx
+++ b/Source/cmVisualStudio10TargetGenerator.cxx
@@ -3791,12 +3791,14 @@ bool cmVisualStudio10TargetGenerator::ComputeLinkOptions(
 
     std::string pdb = cmStrCat(this->GeneratorTarget->GetPDBDirectory(config),
                                '/', targetNames.PDB);
-    std::string imLib =
-      cmStrCat(this->GeneratorTarget->GetDirectory(
-                 config, cmStateEnums::ImportLibraryArtifact),
-               '/', targetNames.ImportLibrary);
+    if (!targetNames.ImportLibrary.empty()) {
+      std::string imLib =
+        cmStrCat(this->GeneratorTarget->GetDirectory(
+                   config, cmStateEnums::ImportLibraryArtifact),
+                 '/', targetNames.ImportLibrary);
 
-    linkOptions.AddFlag("ImportLibrary", imLib);
+      linkOptions.AddFlag("ImportLibrary", imLib);
+    }
     linkOptions.AddFlag("ProgramDataBaseFile", pdb);
 
     // A Windows Runtime component uses internal .NET metadata,
diff --git a/Tests/RunCMake/VS10Project/NoImpLib-check.cmake b/Tests/RunCMake/VS10Project/NoImpLib-check.cmake
new file mode 100644
index 0000000..50722b2
--- /dev/null
+++ b/Tests/RunCMake/VS10Project/NoImpLib-check.cmake
@@ -0,0 +1,23 @@
+set(vcProjectFile "${RunCMake_TEST_BINARY_DIR}/foo.vcxproj")
+if(NOT EXISTS "${vcProjectFile}")
+  set(RunCMake_TEST_FAILED "Project file ${vcProjectFile} does not exist.")
+  return()
+endif()
+
+set(found_ImportLibrary 0)
+set(found_TargetExt_dll 0)
+file(STRINGS "${vcProjectFile}" lines)
+foreach(line IN LISTS lines)
+  if(line MATCHES "<ImportLibrary>")
+    set(found_ImportLibrary 1)
+  endif()
+  if(line MATCHES "<TargetExt[^\n]*\\.dll")
+    set(found_TargetExt_dll 1)
+  endif()
+endforeach()
+if(found_ImportLibrary)
+  string(APPEND RunCMake_TEST_FAILED "ImportLibrary incorrectly found in\n  ${vcProjectFile}\n")
+endif()
+if(NOT found_TargetExt_dll)
+  string(APPEND RunCMake_TEST_FAILED "TargetExt not found in\n  ${vcProjectFile}\n")
+endif()
diff --git a/Tests/RunCMake/VS10Project/NoImpLib.cmake b/Tests/RunCMake/VS10Project/NoImpLib.cmake
new file mode 100644
index 0000000..2c11eac
--- /dev/null
+++ b/Tests/RunCMake/VS10Project/NoImpLib.cmake
@@ -0,0 +1,3 @@
+enable_language(C)
+set(CMAKE_IMPORT_LIBRARY_SUFFIX  "")
+add_library(foo SHARED empty.c)
diff --git a/Tests/RunCMake/VS10Project/RunCMakeTest.cmake b/Tests/RunCMake/VS10Project/RunCMakeTest.cmake
index 8e56e1b..133dacc 100644
--- a/Tests/RunCMake/VS10Project/RunCMakeTest.cmake
+++ b/Tests/RunCMake/VS10Project/RunCMakeTest.cmake
@@ -11,6 +11,7 @@ run_cmake(VsCsharpSourceGroup)
 run_cmake(VsCSharpCompilerOpts)
 run_cmake(ExplicitCMakeLists)
 run_cmake(InterfaceLibSources)
+run_cmake(NoImpLib)
 run_cmake(RuntimeLibrary)
 run_cmake(SourceGroupCMakeLists)
 run_cmake(SourceGroupTreeCMakeLists)